Black Box LDM-144LR Especificações descarregar pdf (Página 15)

LDM-MR19.2

However, there is a difference in multipoint applications, where the master

modem communicates with modems at different distances. When the master

modem is set to AGC-ON, the master can communicate across long distances (up

to its maximum range) to the slave modems. However, this setting increases the

RTS-to-CTS delay. For example, under AGC-ON, the CTS delay of all slaves must

be set to 64 ms when the data rate is less than 9.6 Kbps.

When the master modem is set to AGC-CNTR, it can’t transmit or receive across

as much distance. However, the polling goes faster. For example, under AGC-

CNTR, the CTS delay of all units can be set to 8 ms when the data rate is greater

than or equal to 4.8 Kbps.

Table 2-1, below, contains general guidelines for choosing AGC and CTS-delay

settings. Each application is unique, however; you might find that your LDM-

MR19.2 system works better when the units are set slightly differently.

Table 2-1. Recommended Multipoint AGC and CTS-Delay Settings

Distance Data Rate Master Master Slave Slave

Between AGC CTS Delay AGC CTS Delay

Modems*

Short range ≤2.4 Kbps CNTR 64 ms CNTR 64 ms

Short range >2.4 Kbps, CNTR 8 or 64 ms ON 64 ms

<4.8 Kbps

Short range ≥4.8 Kbps CNTR 8 or 64 ms ON 8 or 64 ms

Long range <9.6 Kbps ON 8 or 64 ms ON 64 ms

Long range ≥9.6 Kbps ON 8 or 64 ms ON 8 or 64 ms

* “Short range” = up to 2.8 mi. (4.5 km) for data rates of 9.6 or 19.2 Kbps or up to 3.7 mi. (6 km)

for data rates of 3.6 to 7.2 Kbps. “Long range” represents distances greater than these.

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